[英]Cannot decrypt data with C# that was encrypted using PHP (Rijdael-128)
我用這段代碼用PHP解密數據:
$content="1234";
$cp = mcrypt_module_open('rijndael-128', '', 'cbc', '');
$iv = mcrypt_create_iv(16, MCRYPT_RAND);
$key = pack("H*",md5('a'));
mcrypt_generic_init($cp, $key, $iv);
$encrypted = mcrypt_generic($cp, $content);
echo base64_encode($key)."\n";
echo base64_encode($iv)."\n";
echo base64_encode($encrypted)."\n";
mcrypt_generic_deinit($cp);
mcrypt_module_close($cp);
然后將$ iv和$ encrypted保存到文件中並在C#示例應用程序中讀取:
var iv=...;
var encrypted=...;
var md5 = new MD5CryptoServiceProvider();
var key = md5.ComputeHash(Encoding.Default.GetBytes("a"));
md5.Clear();
Console.WriteLine(Convert.ToBase64String(key));
Console.WriteLine(Convert.ToBase64String(iv));
Console.WriteLine(Convert.ToBase64String(encrypted));
這里的輸出與PHP的輸出完全相同,所以我可以保證中間沒有編碼錯誤。
var rd = new RijndaelManaged {
Key = key,
IV = iv,
Mode = CipherMode.CBC,
KeySize = 128,
Padding = PaddingMode.Zeros
};
var buffer = new byte[encrypted.Length];
using(var ms = new MemoryStream(buffer)) {
using(var cs = new CryptoStream(ms, rd.CreateDecryptor(), CryptoStreamMode.Write)) {
cs.Write(encrypted, 0, encrypted.Length);
ms.Read(buffer, 0, buffer.Length);
Console.WriteLine(Encoding.Default.GetString(buffer));
}
}
rd.Clear();
解密的結果在每個程序啟動時都會有所不同,即使輸入數據完全相同:
第一次運行:
DMF1ucDxtqgxw5niaXcmYQ == <-Key
GoCeRkrL / EMKNH / BYeLsqQ == <-IV
UBE3DkgbJgj1K / TISugLxA == < - 加密
OlOB99yiCYRDoLx + 0xxZxQ == < - “Decrypted”
第二輪:
DMF1ucDxtqgxw5niaXcmYQ == <-Key
GoCeRkrL / EMKNH / BYeLsqQ == <-IV
UBE3DkgbJgj1K / TISugLxA == < - 加密
w5fcY5Fbb9KRgoHfhqAztA == < - “Decrypted”
密鑰,IV,加密數據是相同的,但解密日期仍然不同,總是錯誤的。 緩沖區應包含“1234”或“1234”加上12個尾隨零。
我不明白為什么結果會有所不同,哪些不起作用,但我現在已經盯着這段代碼幾個小時了,可能會錯過明顯的錯誤......
像這樣反轉CryptoStream會產生相同錯誤的結果:
using(var ms = new MemoryStream(encrypted)) {
using(var cs = new CryptoStream(ms, rd.CreateDecryptor(), CryptoStreamMode.Read)) {
cs.Read(buffer, 0, buffer.Length);
Console.WriteLine(Convert.ToBase64String(buffer));
}
}
救命? 謝謝! 亞歷山大
好吧,修改過去我的罪過的舊樣本我最終得到了這個:
static string Decrypt() {
byte[] keyBytes = Convert.FromBase64String("DMF1ucDxtqgxw5niaXcmYQ==");
byte[] iv = Convert.FromBase64String("GoCeRkrL/EMKNH/BYeLsqQ==");
byte[] cipherTextBytes = Convert.FromBase64String("UBE3DkgbJgj1K/TISugLxA==");
var symmetricKey = new RijndaelManaged { Mode = CipherMode.CBC, IV = iv, KeySize = 128, Key = keyBytes, Padding = PaddingMode.Zeros};
using (var decryptor = symmetricKey.CreateDecryptor())
using (var ms = new MemoryStream(cipherTextBytes))
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) {
var plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cs.Read(plainTextBytes, 0, plainTextBytes.Length);
return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
}
它給了“1234”尾隨\\ 0字符..你是否忘記將字節[]再次轉換為字符串? 我還缺少什么其他的區別?
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